it can be a singles 1v1 or tag 2v2 or triple threat 1v1v1 or pretty much any kind but what is special is a group of other wrestlers surround the ring and when one falls out the lumberjacks are suppose to return them to the ring

In a lumberjack match a bunch of wrestlers surround the ring. If one of the wrestlers in the ring leaves the ring ( or is tossed out) the other wrestlers (the lumberjacks) beat him up a little and toss him back in the ring.

Usually 1/2 the lumberjacks are friends of the good guy in the match and 1/2 are friends with the bad guy. So, the guy in the ring usually tries to toss his opponent out to let his friends beat them up some.